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Danbooru-based image board with a specialization in high-quality images.

On the options to the left, the first link is the edit option. Or you can scroll down to the bottom and beside the Respond there's the edit.

Once in the edit screen, the second option is the parent post option. To parent a image, simply find the moe image identification number and for this one it is 48684 and type or copy/paste that number to the parent post. And that image would be the parent of the image you did this for.